Question

A solution contains a mixture of pentane and hexane at room temperature. The solution has a vapor pressure of 255 torrtorr . Pure pentane and hexane have vapor pressures of 425 torrtorr and 151 torrtorr, respectively, at room temperature.What is the mole fraction of hexane?

Answer 1

Make a graph

Explanation: edge 2021

Answer 2

The mole fraction of hexane is 0.6204

Step-by-step explanation:

Obs: X hex = 1 - X pen

Ptot = P pen + P hex

Ptot = X pen P pen + X hex P hex ---> applying X hex = 1 - X pen

X pen = (Ptot - P hex) / (P pen - P hex)

X pen = (255 - 151) / (425 - 151) = 0.3795

X hex = 1 - X pen

X hex = 1 - 0.3795 = 0.6204